[Раед]

<script type="text/javascript">
function myfunc() {
    if (document.form.apname.checked == true) {
                        document.getElementById('new').style.display = "block";
 
                             
    } else{
                        document.getElementById('new').style.display = "none";
 
    }
}
</script>
 
<form id="form" name="form" method="post" action="">
    <div>
        <input type="checkbox" name="apname" id="apCheckDis" onclick="myfunc()">
    </div>
    <div id="new" style="display:none">
 
        <input type="radio" name="atname" value="0">
        <input type="radio" name="atname" value="1">
        </div>
 
</form>